You need to have the cam specks In order to build the head(set the head up for the right springs and proper machine work is done)Why go back and have to redo the for the spring pads Or different lenght Valves So you don't end up with Coil bind.Because the springs were not set-up for the Cam(lift)
You also Need to know what compression your after So that If the head needs to be milled Or not.(for what ever CC's your after)
So you have to plain ahead (no pun) if your plain is to Buy a head before hand.
Just more food for thought & my2cents
God doesn't like ugly.
